The current latest version of TeX Live is 2018, which can be obtained from: http://tug.org/texlive/acquire.html , http://tug.org/texlive/acquire-dvd.html .
The development team said that this year's TEX Live was dedicated to their colleague Staszek Wawrykiewicz, who passed away.
The following describes the update content
epTEX, eupTEX: new primitives \epTeXversion
LuaTEX: Ready to upgrade to LuaTEX 5.3 in 2019: A luatex53 program is available on most platforms, but must be renamed luatex to be used. Or use the documentation from ConTEXt Garden ( http://wiki.contextgarden.net ); more info there
MetaPost: fixes for wrong path direction, TFM and PNG output
pdfTEX: allow bitmap fonts to use encoding vector; current directory is no longer added to PDF ID calculation; bugfixes and related changes to \pdfprimitive
XeTEX: support /Rotate when inserting PDF image files; return non-zero exit code if exporter fails; many UTF-8 and primitive fixes
MacTEX: See below for changes supported by macOS versions. In addition, the files installed by MacTEX under /Applications/TeX/ have been reorganized for clarity; this directory now contains four GUI programs (BibDesk, LaTeXiT, TeX Live Utility and TeXShop), its subdirectories then contains the rest of the utilities and documentation
tlmgr: new tlshell (Tcl/Tk) and tlcockpit (Java) frontends; JSON output; uninstall can now be used instead of remove; new print-platform-info option
Platform support
New: x86_64-linuxmusl and aarch64-linux. Removed: armel-linux, powerpc-linux
x86_64-darwin support 10.10–10.13 (Yosemite, El Capitan, Sierra sum High Sierra)
x86_64-darwinlegacy supports 10.6–10.10 (though 10.10 is best with x86_64-darwin). Removed all support for 10.5 (Leopard), which means the powerpc-darwin and i386-darwin platforms are removed
Windows: XP is no longer supported
future
TEX Live is not perfect and will never be perfect. We hope to keep releasing new versions, and we hope to provide more help documentation, more utilities, more installers, and of course more updated packages and fonts, and everything else related to TEX. This work is done by volunteers in their free time, so there is always more to be done. See http://tug.org/texlive/contribute.html
For detailed update instructions, please see:
http://tug.org/texlive/doc/texlive-en/texlive-en.html#news
http://www.tug.org/texlive/doc/texlive-zh-cn/texlive-zh-cn.pdf